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US 8,273,928 B2Granted
Processes for separation of fluoroolefins from hydrogen fluoride by azeotropic distillation
AssigneeE. I. Du Pont de Nemours and Company
InventorsJeffrey P. Knapp, Barry Asher Mahler, Donald J. Toton
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Abstract
The present disclosure relates to a process for separating a fluoroolefin from a mixture comprising hydrogen fluoride and fluoroolefin, comprising azeotropic distillation both with and without an entrainer. In particular are disclosed processes for separating any of HFC-1225ye, HFC-1234ze, HFC-1234yf or HFC-1243zf from HF.
Claims12
A process for separating a mixture comprising HF and fluoroolefin, said process comprising:
- a. feeding the composition comprising HF and fluoroolefin to a first distillation column;
- b. removing an azeotrope composition comprising HF and fluoroolefin as a first distillate and either i) HF or ii) fluoroolefin as a first column bottoms composition;
- c. condensing the first distillate to form 2 liquid phases, being i) an HF-rich phase and ii) a fluoroolefin-rich phase and separating said 2 liquid phases in a decanter;
- and
- d. recycling a first liquid phase enriched in the same compound that is removed as the first column bottoms, said first liquid phase being either i) HF-rich phase or ii) fluoroolefin-rich phase, back to the first distillation column.
2 more elements
Dependencies are inferred from the claim text.